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chromium/third_party/blink/web_tests/fast/dom/HTMLTemplateElement/cloneNode.html 

<!DOCTYPE html>
<template id="template"><span>Contents</span></template>
<script src="../../../resources/js-test.js"></script>
<script>

description('Test that template contents are not cloned when the template element is cloned');

var template = document.getElementById('template');
var div = template.appendChild(document.createElement('div'));

shouldBe('template.content.childNodes.length', '1');
var clone = template.cloneNode(true);
shouldBe('clone.content.childNodes.length', '1');
shouldBe('clone.outerHTML', 'template.outerHTML');
shouldNotBe('clone.content.firstChild', 'template.content.firstChild');
shouldNotBe('clone.content', 'template.content');
shouldBe('clone.firstChild.tagName', '"DIV"');
shouldNotBe('clone.firstChild', 'div');

</script>